Design of a Miniaturized Wireless Blood Pressure Sensing Interface Using Capacitive Coupling

This paper presents the implementation of a miniaturized wireless blood pressure sensor interface. The system uses capacitive coupling in order to transmit the data, as well as wireless inductive powering. Designed for a bit length of 6.4 mu s, the average power consumption of the device has been measured to be 20.5 mu W and 2.85 mW in air and phantom material, respectively. The miniaturized sensor interface circuit consists of two plates with a diameter of 2.5 cm, which are connected by means of a thin wire; the device's maximum thickness is 5 mm.